noun, Chemistry. 1. the average weight of a molecule of an element or compound measured in units once based on the weight of one hydrogen atom taken as the standard or on 1/16 (0.0625) the weight of an oxygen atom, but after 1961 based on 1/12 (0.083) the weight of the carbon-12 atom; the sum […]

[mol-uh-kyool] /ˈmɒl əˌkyul/ noun 1. Chemistry, Physics. the smallest physical unit of an element or compound, consisting of one or more like atoms in an element and two or more different atoms in a compound. 2. Chemistry. a quantity of a substance, the weight of which, measured in any chosen unit, is numerically equal to […]

noun, Chemistry. 1. the ratio of the number of moles of a given component of a mixture to the total number of moles of all the components. mole fraction n. The ratio of the moles of one component of a system to the total moles of all components present.

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